/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.group.config;

import com.alibaba.polardbx.atom.TAtomDataSource;
import com.alibaba.polardbx.common.jdbc.MasterSlave;
import com.alibaba.polardbx.common.utils.Pair;
import com.alibaba.polardbx.common.utils.logger.Logger;
import com.alibaba.polardbx.common.utils.logger.LoggerFactory;
import com.alibaba.polardbx.rpc.compatible.XDataSource;

public class MasterOnlyGroupDataSourceHolder implements GroupDataSourceHolder {
    private static final Logger logger = LoggerFactory.getLogger(MasterOnlyGroupDataSourceHolder.class);

    private final TAtomDataSource masterDataSource;

    public MasterOnlyGroupDataSourceHolder(TAtomDataSource masterDataSource) {
        this.masterDataSource = masterDataSource;
    }

    @Override
    public TAtomDataSource getDataSource(MasterSlave masterSlave) {
        return this.masterDataSource;
    }

    @Override
    public Pair<Boolean, XDataSource> isChangingLeader(MasterSlave masterSlave) {
        try {
            if (masterDataSource.getDataSource().isWrapperFor(XDataSource.class)) {
                final XDataSource unwrap = masterDataSource.getDataSource().unwrap(XDataSource.class);
                return Pair.of(unwrap.getClientPool().isChangingLeader(), unwrap);
            }
            return Pair.of(false, null);
        } catch (Exception e) {
            logger.error("get isChangingLeader error", e);
            return Pair.of(false, null);
        }
    }
}
